dithering is - man this is difficult to describe - i guess i can say that it’s adding noise to your audio to prevent harshness. in other words, it smooth things out and make it sound less jagged and raw. it's almost like a filter on a camera to soften the image or like blurring the lines of your pencil drawing... i'm more of a picture person so i’ll explain it with a few illustrations below where i'll use colour instead of sound. i guess the guys from
Izotope Ozone describe
it best - quite a good read. if you want to know more about
16-bit vs. 24-bit TweakHeadz is the place to go.
the gradient fill on the left represents the audio we want to capture...
:) 
we record at 24-bit (bit is short for binary digit = 10110 etc). i’ll illustrate 24-bit as 24 colours.
when you export your mix/master to CD it goes down even further to 16-bit. why? because CDs can only read 16-bit data.
to fix this raw sounding audio file you apply dithering. now it looks (sounds) more like the original audio we intended to capture :)
the gradient fill on the left represents the audio we want to capture... :) 
we record at 24-bit (bit is short for binary digit = 10110 etc). i’ll illustrate 24-bit as 24 colours.
when you export your mix/master to CD it goes down even further to 16-bit. why? because CDs can only read 16-bit data.
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